I should warn you that DensShield is a gypsum based product. It's esentially a fiber reinforced drywall with a waterproof vinyl face on it. So if you're dead set against any gypsum based products don't use it. In my experience it's the mudding and sanding of drywall that creates all the dust. If you pre-cut your dens outside and bring it in you should have no dust.

Like I said before: do not install Kerdi over den's shield. You will create a vapor lock. This means that the moisture in the thinset used to put up the kerdi is sandwiched between two layers of waterproof materials and will never dry out.

PistolPete, thanks for that! I have been scratching my head over exactly how there would be a problem, and you have just explained it.

Thinking about all the options, I trust the seal from the Kerdi wrap. One distributor told me to seal right under the drywall and onto the flange of the tub.

No panel-plus-liquid could seal that thoroughly. Jaz said this:

"Use regular drywall, it's better (stiffer), than green board."

I find that surprising. I thought the green layer was the only difference.

I guess I will have more dust to deal with.

Hello, I used Green-E-Board for a tub surround and used Red Guard liquid membrane over it. The Green-E-Board was easy to cut with a table saw and it is very ridgid with no tapered edges if butting up to drywall.

It seems to be a good alternative to cement board with less granules shedding from the board and has similar water resistant properties as cement board.
Just a thought and may be another option.

Scott on your next project you can simply use a box cutter to cut Green EBoard. This new backer board is very impressive. I have used it on about 85% of all our projects this past year.

We love it. Score - Snap - Done.

It can also be shaped which makes fixing slight imperfections easier.

Drywall of any kind. Blue. Purple. Green. Should not be installed in any shower renovation - covered with Kerdi or liquid membrane may be allowed by the manufacture but not by local building inspectors. Here in Vancouver drywall is not accepted in a shower regardless of the fact it's covered with Kerdi.

Make sure that all your backer boards are clean and free of dust before starting any waterproofing process. We vacum and wash the green eboard before applying Noble Seal TS or liquid membranes.

http://i839.photobucket.com/albums/zz314...ng/IMG_2542.jpg

This tub surround was boarded with Green EBoard and waterproofed with Mapei's Aqua Defence.

http://i839.photobucket.com/albums/zz314...ng/IMG_2544.jpg



Notice how dark the colour is. You want a 22 mil coverage or 3 good coats with a brush. I notice many times online installers applying their liquid membranes to thin.

At KBIS Noble Company did a presentation on why waterproofing systems fail and a common failure was not having proper coverage. Another was not giving your projects enough time to cure before flood testing.